AutoCodes – GMC – P07C0 GMC

P07C0 GMC Code - Transmission Input Speed Sensor Circuit High Voltage

Quick Answer

The Input Speed Sensor detects the primary pulley revolution speed and sends a signal to the Transmission. Common causes include Faulty Transmission Input Speed Sensor, Transmission Input Speed Sensor harness is open or shorted, Transmission Input Speed Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P07C0 GMC indicates Transmission Input Speed Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Transmission Input Speed Sensor, Transmission Input Speed Sensor harness is open or shorted, Transmission Input Speed Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 367

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P07C0 GMC Description

The Input Speed Sensor detects the primary pulley revolution speed and sends a signal to the Transmission. The Input Speed Sensor (ISS), also known as the transmission turbine speed sensor, is a hall-effect type sensor. The ISS mounts to the control valve upper body assembly and connects to the control solenoid (w/body and Transmission Control Module (TCM)) valve assembly through a wire harness and connector. The sensor faces the 1-2-3-4 and 3-5-R clutch housing machined teeth surface. The sensor receives 8.3-9.3 volts on the Input/Output Speed Sensor (ISS/OSS) supply voltage circuit from the Transmission Control Module (TCM). As the 1-2-3-4 and 3-5-R clutch housing rotates, the sensor produces a signal frequency based on the machined surface of the 1-2-3-4 and 3-5-R clutch housing. This signal is transmitted through the ISS signal circuit to the control solenoid (w/body and TCM) valve assembly. The control solenoid (w/body and TCM) valve assembly uses the ISS signal to determine line pressure, transmission shift patterns, Torque Converter Clutch (TCC) slip speed, and gear ratio. The Diagnostic Trouble Code (DTC) will be set when the TCM detects the ISS signal circuit voltage is greater than 4.75 V for 0.8 s.

OBDII Code P07C0 GMC - Transmission Input Speed Sensor Circuit High Voltage - AutoCodes.com — P07C0 GMC Code - Transmission Input Speed Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P07C0 GMC?

Faulty Transmission Input Speed Sensor
Transmission Input Speed Sensor harness is open or shorted
Transmission Input Speed Sensor circuit poor electrical connection
Faulty Control Solenoid Valve Assembly

How to Fix the DTC P07C0 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P07C0 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P07C0 GMC code?

Need more information on how to fix the P07C0 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P07C0 2014 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2015 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2016 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2017 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2018 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2019 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2020 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2021 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2022 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2023 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage
P07C0 2024 GMC Sierra — Transmission Input Speed Sensor Circuit High Voltage

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P07C0 GMC Code

1. What does the OBDII code P07C0 mean for a GMC vehicle?

Code P07C0 indicates a high voltage issue in the Transmission Input Speed Sensor Circuit, which monitors the rotational speed of the transmission input shaft.

2. What are the common symptoms of code P07C0 in a GMC?

Symptoms may include erratic shifting, transmission slipping, reduced fuel efficiency, or the Check Engine Light being illuminated.

3. What causes the P07C0 code to appear?

Common causes include a faulty transmission input speed sensor, damaged wiring or connectors, or issues with the vehicleâ€™s powertrain control module (PCM).

4. Can I drive my GMC with the P07C0 code?

Driving with this code is not recommended as it can lead to transmission damage or unsafe driving conditions due to erratic shifting.

5. How do you diagnose the P07C0 code in a GMC?

Diagnosis typically involves inspecting the transmission input speed sensor, checking the wiring and connectors for damage, and testing the PCM for proper functionality.

6. How is the P07C0 code fixed?

Repairs may include replacing the faulty sensor, repairing or replacing damaged wiring, and, in rare cases, reprogramming or replacing the PCM.

7. How much does it cost to fix the P07C0 code on a GMC?

Repair costs vary but generally range from $150 to $400, depending on whether the sensor, wiring, or PCM needs replacement.

8. Can a low battery cause the P07C0 code?

Yes, a weak or failing battery can cause voltage irregularities that may trigger this code.

9. Will clearing the P07C0 code resolve the issue?

Clearing the code without addressing the underlying problem will not fix the issue, and the code is likely to return.

10. How can I prevent the P07C0 code from occurring in the future?

Regular maintenance, including checking electrical connections and ensuring the transmission fluid is clean and at proper levels, can help prevent this code.